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Loans and allowance for credit losses - Impaired Loans Average Recorded Investment and Interest Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Average recorded investment |  |
With a related allowance recorded | $ 10,568 | $ 4,122
With no related allowance recorded | 8,197 | 7,423
Total impaired loans | 18,765 | 11,545
Interest income recognized (cash basis) |  |
With a related allowance recorded | 624 | 175
With no related allowance recorded | 575 | 418
Total impaired loans | 1,199 | 593
Commercial and industrial |  |
Average recorded investment |  |
With a related allowance recorded | 3,349 | 335
With no related allowance recorded | 2,088 | 1,377
Interest income recognized (cash basis) |  |
With a related allowance recorded | 474 | 121
With no related allowance recorded | 201 | 70
Construction |  |
Average recorded investment |  |
With no related allowance recorded | 1,641 | 1,255
Interest income recognized (cash basis) |  |
With no related allowance recorded | 167 | 74
Residential real estate | 1-to-4 family mortgage |  |
Average recorded investment |  |
With a related allowance recorded | 205 | 170
With no related allowance recorded | 963 | 955
Interest income recognized (cash basis) |  |
With a related allowance recorded | 13 | 9
With no related allowance recorded | 68 | 74
Residential real estate | Residential line of credit |  |
Average recorded investment |  |
With no related allowance recorded | 252 | 123
Interest income recognized (cash basis) |  |
With no related allowance recorded | 1 | 15
Commercial real estate | Owner occupied |  |
Average recorded investment |  |
With a related allowance recorded | 658 | 702
With no related allowance recorded | 2,143 | 1,862
Interest income recognized (cash basis) |  |
With a related allowance recorded | 27 | 43
With no related allowance recorded | 133 | 148
Commercial real estate | Non-owner occupied |  |
Average recorded investment |  |
With a related allowance recorded | 6,196 | 2,915
With no related allowance recorded | 1,049 | 1,313
Interest income recognized (cash basis) |  |
With a related allowance recorded | 109 | 2
With no related allowance recorded | 0 | 7
Consumer and other |  |
Average recorded investment |  |
With a related allowance recorded | 0 | 0
With no related allowance recorded | 61 | 49
Interest income recognized (cash basis) |  |
With a related allowance recorded | 0 | 0
With no related allowance recorded | $ 5 | $ 4

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524 + Details
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